Repairing Wood Rot In Your Deck: Everything You Need To Know

If you have a deck, there’s a good chance that you’ve noticed some wood rot in the past. This is especially common near the root of your deck, where water tends to accumulate.
While it may be tempting to just pull out the offending root and call it a day, this isn’t always the best solution.

In this blog post, we’ll tach you everything about repairing wood rot in your deck – how to fix this issue and prevent your wood deck from rotting in the future.

Two chairs on a deck with a patch of grass and a privacy fence

1. What Is Wood Rot And How Can It Damage Your Deck

Wood root is a type of fungus that can grow in wet environments. Left untreated, wood root can cause serious damage to your deck. The fungus can eat away at the wood, eventually leading to structural failure. It’s therefore important to take steps to repair any damage caused by wood root as soon as possible.

Act as quickly as possible once you spot wood rot on your deck. If we’re called out to deal with the issue, we’ll inject a special preservative into your timber and then seal it up with a clear stain. Alternatively, you could try removing the fungus yourself by cutting away at the root, although this may leave some unsightly damage.

2. How To Identify Wood Rot

The easiest way to tell if your deck has wood rot is to look for signs of moisture accumulation and/or discoloration. If you notice any of these symptoms, it’s likely that you have wood rot and will need to take corrective action.

You may also notice white, powdery looking growth around the deck’s base. You can test this for yourself by wiping away part of the fungus and exposing the wood underneath – if you find moist wood beneath the surface, then it’s likely that you’re dealing with a serious rot problem.

Rotted wood deck boards

Signs To Look For

There are different types of rot, each with their own distinguishable features. The most common types are:

3. How You Know If The Rot Has Spread To Other Areas

If you’re not sure whether or not your wood rot has spread elsewhere, you can follow these steps to determine if your deck needs further inspection.

Use a putty knife to scrape off the top layer of rotted wood in an affected area, exposing the surface beneath. Inspect the exposed wood for moisture and visible fungus. If there is no sign of water, then you may need to call in a professional deck inspector to help pinpoint any hidden rot that may be damaging the wood.

repairing wood rot tools

4. Ways To Stop Your Deck From Rotting

This is how you can prevent rot in the future:

5. What To Do If Your Decks Has Already Been Damaged

If your deck has been weakened by rot, there are a number of steps you can take to repair rotted wood. You’ll first need to cut away the infected wood. It’s important that you thoroughly clean the area where rotting has occurred before treating – this will help prevent further damage during repairs.

Once you’ve removed all traces of rot from your damaged area, carefully treat any remaining healthy wood with preservatives before filling in the gaps with an epoxy filler or a polyester filler

You’ll then need to sand the wood until it’s smooth before applying a stain or paint

6. How To Prevent Your Deck From Rotting In Winter

You can stop your deck from rotting in winter by following these steps:

Before winter hits, apply a coat of preservative to the deck’s surface. Reapply every few months to make sure that your deck is completely protected against fungus and other rot-causing agents.

Deck in winter

7. DIY Vs Professional Assistance

There are a few things you can do to try and fix the damage yourself, but in some cases it may be necessary to call in a professional.

If the rot has only affected a small area, you may be able to cut away the rotted or damaged wood and treat any remaining healthy wood. If the rot has spread, however, you’ll need to remove all traces of it and rebuild the damaged area, which may require professional assistance.

Whatever you decide, make sure you act immediately as wood rot tends to spread quickly and become a real problem if not treated.

8. Cost Of Repairing Wood Rot

Depending on the extent of the damage, repairing rotted wood on your deck can cost anywhere from a few hundred dollars to a few thousand dollars, and you will be able to fix the problem yourself.

If the rot has spread, however, you’ll need to remove all traces of it and rebuild the damaged area, which may require professional assistance.


Rotting wood in your deck can be a serious issue that will lead to structural damage and an unsightly appearance. 

If you’re worried about the condition of your own deck, we recommend having it inspected by a professional as soon as possible so they can provide recommendations on how best repair rotted wood.

We hope this article has been helpful for fixing wood rot in your deck! For more information or help on repairing wood rot or preventing future issues, contact us today.